Can someone help with this?
Thread Starter
Melting Slicks
Joined: Aug 2010
Posts: 2,487
Likes: 10
From: Palm Beach Florida
St. Jude Donor '12
Can someone help with this?
My buddy is tearing into his cali, 82 cross-fire. We are going to carb. it. Can anybody tell me why the rear water jackets were plugged? Also the cross-fire had a return fuel line, does this line go straight to the tank, or to the fuel pump in the tank? When we put the carb, on can we just plug the return line? Thanks.....
Pro
Joined: May 2011
Posts: 581
Likes: 5
From: BC
As to the fuel system, if you are going to use the existing fuel pump you will need to put a pressure regulater in the line. That pump likely puts out about 40 psi or more and a carb only wants around 5. Ideally you want the style that is mostly used in the oe injection system, one that dumps flow back to the tank to reduce pressure. An in tank pump likes to flow fuel to keep cool. I would suspect that it would cut the life expectancy quite a bit if it was only allowed to flow what the needle and seat will allow.
Steve g
Race Director
Joined: Mar 2006
Posts: 14,112
Likes: 28
From: Florida
Chevy heads are open, some intakes are closed in the back.
The fuel pressure is only around 15psi, but it's still way too much for a carb.
It's always better to use a return and one of the reasons is a more consistant flow and pressure.
Use a good quality "bypass regulator" and try for as little pressure as possible and increase pressure until it won't starve at flat out rpm for whatever time period you can get away with.
I've run qjets with as little as 4psi.
The fuel pressure is only around 15psi, but it's still way too much for a carb.
It's always better to use a return and one of the reasons is a more consistant flow and pressure.
Use a good quality "bypass regulator" and try for as little pressure as possible and increase pressure until it won't starve at flat out rpm for whatever time period you can get away with.
I've run qjets with as little as 4psi.
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Thread Starter
Melting Slicks
Joined: Aug 2010
Posts: 2,487
Likes: 10
From: Palm Beach Florida
St. Jude Donor '12
Chevy heads are open, some intakes are closed in the back.
The fuel pressure is only around 15psi, but it's still way too much for a carb.
It's always better to use a return and one of the reasons is a more consistant flow and pressure.
Use a good quality "bypass regulator" and try for as little pressure as possible and increase pressure until it won't starve at flat out rpm for whatever time period you can get away with.
I've run qjets with as little as 4psi.
The fuel pressure is only around 15psi, but it's still way too much for a carb.
It's always better to use a return and one of the reasons is a more consistant flow and pressure.
Use a good quality "bypass regulator" and try for as little pressure as possible and increase pressure until it won't starve at flat out rpm for whatever time period you can get away with.
I've run qjets with as little as 4psi.
Thread Starter
Melting Slicks
Joined: Aug 2010
Posts: 2,487
Likes: 10
From: Palm Beach Florida
St. Jude Donor '12
Why? Shouldn't the pump be on when the key is in the on position. Worst case I should be able to connect the wires leading from the pump to a circut that is on when the key is on. Anyways we are getting a new electrical clip that will help with the auto tranny. It's made for this conversion.
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
If I remember right the fuel pump is tied to the computer plus an oil pressure sensor.
Not sure exactly what your eliminating. No doubt with some wiring you can make it work but as you said you have to buy a fuel reg so I just wondered if going to a mech pump might be a simpler way to go.
Not sure exactly what your eliminating. No doubt with some wiring you can make it work but as you said you have to buy a fuel reg so I just wondered if going to a mech pump might be a simpler way to go.
Thread Starter
Melting Slicks
Joined: Aug 2010
Posts: 2,487
Likes: 10
From: Palm Beach Florida
St. Jude Donor '12
If I remember right the fuel pump is tied to the computer plus an oil pressure sensor.
Not sure exactly what your eliminating. No doubt with some wiring you can make it work but as you said you have to buy a fuel reg so I just wondered if going to a mech pump might be a simpler way to go.
Not sure exactly what your eliminating. No doubt with some wiring you can make it work but as you said you have to buy a fuel reg so I just wondered if going to a mech pump might be a simpler way to go.